Apparatus and Method for Feeding Back Channel Quality Information and Scheduling Apparatus and Method Using the Same in a Wireless Communication System

1. A method for transmitting channel quality indicator (CQI) information in a wireless communication system, the method comprising: obtaining, at a mobile station, a wideband CQI; obtaining, at the mobile station, a sub-band CQI for a sub-band selected by the mobile station; encoding the wideband CQI and the sub-band CQI; modulating the wideband CQI and the sub-band CQI based on a modulation scheme; mapping the wideband CQI and sub-band CQI on an allocated physical channel; and transmitting, at the mobile station, the wideband CQI, the sub-band CQI for the sub-band, and an index for the sub-band on the allocated physical channel, wherein the wideband CQI and the sub-band CQI are transmitted using a same transmission time interval in an aperiodic CQI report.

2. The method of claim 1 , wherein a number of sub-bands selected by the mobile station is less than a total number of sub-bands of a wideband corresponding to the wideband CQI.

3. The method of claim 1 , wherein the wideband CQI and the sub-band CQI are calculated based on a predetermined reference signal from a base station.

4. A method for receiving channel quality indicator (CQI) information in a wireless communication system, the method comprising: receiving and demapping a wideband CQI and a sub-band CQI on an allocated physical channel; demodulating the wideband CQI and the sub-band CQI based on a defined modulation scheme; and decoding and obtaining the wideband CQI and the sub-band CQI for a sub-band, wherein the sub-band CQI is received with an index for the sub-band band selected by a mobile station, and wherein the wideband CQI and the sub-band CQI are received using a same transmission time interval in an aperiodic CQI report.

5. The method of claim 4 , wherein a number of sub-bands selected by the mobile station is less than a total number of sub-bands of a wideband corresponding to the wideband CQI.

6. The method of claim 4 , wherein the wideband CQI and the sub-band CQI are calculated based on a predetermined reference signal from a base station.

7. An apparatus for transmitting, at a mobile station, channel quality indicator (CQI) information in a wireless communication system, the apparatus comprising: at least one processor configured to: obtain a wideband CQI, obtain a sub-band CQI for a sub-band selected by the mobile station, encode the wideband CQI and the sub-band CQI, modulate the wideband CQI and the sub-band CQI based on a modulation scheme, and map the wideband CQI and sub-band CQI on an allocated physical channel; and a transmitter configured to transmit the wideband CQI, the sub-band CQI for the sub-band, and an index for the sub-band on the allocated physical channel, wherein the wideband CQI and the sub-band CQI are transmitted using a same transmission time interval in an aperiodic CQI report.

8. The apparatus of claim 7 , wherein a number of sub-bands selected by the mobile station is less than a total number of sub-bands of a wideband corresponding to the wideband CQI.

9. The apparatus of claim 7 , wherein the wideband CQI and the sub-band CQI are calculated based on a predetermined reference signal from a base station.

10. An apparatus for receiving, at a base station, channel quality indicator (CQI) information in a wireless communication system, the apparatus comprising: a receiver; and at least one processor configured to: receive and demap a wideband CQI and a sub-band CQI on an allocated physical channel, demodulate the wideband CQI and the sub-band CQI based on a defined modulation scheme, and decode and obtain the wideband CQI and the sub-band CQI for a sub-band, wherein the sub-band CQI is received with an index for the sub-band band selected by a mobile station, and wherein the wideband CQI and the sub-band CQI are received using a same transmission time interval in an aperiodic CQI report.

11. The apparatus of claim 10 , wherein a number of sub-bands selected by the mobile station is less than a total number of sub-bands of a wideband corresponding to the wideband CQI.

12. The apparatus of claim 10 , wherein the wideband CQI and the sub-band CQI are calculated based on a predetermined reference signal from the base station.